This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A102177 #17 Aug 12 2021 04:51:14
%S A102177 5,9,22,29,33,38,41,54,60,71,82,100,107,175,180,193,217,258,259,282,
%T A102177 295,360,382
%N A102177 Iccanobirt semiprime indices (7 of 15): Indices of semiprime numbers in A102117.
%F A102177 A102117(a(n)) = A102197(n).
%t A102177 nxt[{a_,b_,c_}]:={b,c,Total[IntegerReverse/@{a,b,c}]};Flatten[ Position[ NestList[nxt,{0,0,1},220][[All,1]],_?(PrimeOmega[#] == 2&)]]-1 (* _Harvey P. Dale_, Dec 30 2018 *)
%Y A102177 Cf. A001358, A102117, A102171-A102185, A102197.
%K A102177 nonn,more,less,base
%O A102177 1,1
%A A102177 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004
%E A102177 a(17) from _Robert Price_, Nov 09 2018
%E A102177 Offset changed to 1 and a(18)-a(23) from _Jinyuan Wang_, Aug 12 2021